package com.bwie.filter;

import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

/**
 * @Author: zhaijiaqi
 * @Date: 2025/4/22 16:39
 * @Description:
 **/
@Configuration
@Order(-1)
public class MyGlobalFilter implements GlobalFilter {
    @Autowired
    StringRedisTemplate redisTemplate;
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //--获取请求参数


        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath();
        System.out.println("请求路径"+url);


        //--白名单

        if(url.contains("/AdminLogin")){
            System.out.println("登录接口白名单"+url);
            return chain.filter(exchange);
        }
        if(url.contains("/UserReg")){
            System.out.println("注册接口白名单"+url);
            return chain.filter(exchange);
        }

        //--检查并验证token
        String token = request.getHeaders().getFirst("token");
        if(token==null||token.isEmpty()){
            System.out.println("token为空"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        Integer userId = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody().get("userId", Integer.class);


        String redistoken = redisTemplate.opsForValue().get("token" + userId);
        if(redistoken==null||redistoken.isEmpty()){
            System.out.println("token已过期"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        if(!token.equals(redistoken)){
            System.out.println("token错误"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }


        //--token续期
        redisTemplate.expire("token" + userId,60,TimeUnit.MINUTES);

        //--放行（转发）
        System.out.println("放行"+url);

        return chain.filter(exchange);


    }
}
